“I felt it was better that I concentrate on one election,” Paul said. “It’s about that time when I should change tactics.”

His announcement will give enough time for anyone with aspirations for his seat to think about running, he said. Paul didn’t want to wait for filing in the 2012 primary to let people know he wasn’t seeking reelection.

“I didn’t want to hold off until in December,” he said. “I thought it shouldn’t be any later than now.”